The problem is you're ignorant to others needs or desires, that's all.
I void just about every point you make ... I'm a CEO of a company and an Industrial Designer. I employ a team of Engineers and do a lot of concept drawing, AI, PS through CAD and extremely heavy emailing .... literally 7 days a week, 18 hours a day I'm paying attention to it.
My tool of choice and the computer I use the most by FAR ... the 11" i7 MacBook Air
Yep, I can concept draw and work in CAD just fine, nothing is handier to pull out and efficiently and quickly reply to emails, research, surf, design, draw, even work in Excel.
My 11" works great anywhere. Some of my best idea's come when I'm not working in my office or at a desk. I prefer to be outside, working in the Great Room or Den of our house.
If necessary for finishing my drawings or detailed work I'll hook up to my 27" ACD for an hour or two. Otherwise I use my Air ALL the time everywhere ... I do that over using my Mac Pro in my office.
Right now I'm sitting in my backyard on the shores of Georgian Bay, running my company, doing design, problem solving, emailing and surfing MacRumors in between for a break.
No way I could do all that on an iPad, lol. And why do I need the footprint, size, weight, disc drive or power of the 15" MBP? The 15" MBP may be the Mercedes 500 or BMW 7 series of notebooks ... not everyone wants or needs that.
I prefer my cars sporty, quick and snappy ... just like my 11" i7
The 11" Air is the best computer I ever owned. (I've used and buy all sizes Mac for my staff, 13" to 17" MBP's, iMac's and iPads too). Every person in my office who does not own an Air, lusts for one.